With long, we can store up to a 19 digit number. Also, you might need to indicate the country code before the phone number such as +46 5555-555555. A phone number is just an integer, no? 00000000 to 11111111. Try using a VARCHAR(20). Validate any international phone number as per E.123 E.123 is a standards-based recommendation by the International Telecommunications Union sector ITU-T. E.123 provides following specifications. Also, you might need to indicate the country code before the phone number such as +46 5555-555555. So it is advised to use integer type of even to store small values. What you said about the hyphen and country codes actually makes a lot of sense. If you need to do exact financial calculations then you need to use more advanced data types - such as the BigDecimal class. I wrapped the phone number in quotes as if it was a string and the challenge passed, but is this the right practice? You may restrict input to only numeric values if you choose to but keep the persisted data to characters. Include the dashes in the output. Hello, I'm in a beginning java class & was assigned the following problem: Write a class using StringTokenizer class to identify parts of a phone number. I tried to run source /Desktop/test.sql and received the error, mysql> . Be aware of the wider world and how their number lengths and formatting may differ before you try to implement any sort of length restrictions, validation or mask (XXX-XXXX-XX). If you want to Store “Country + area + number separately”. Now we need to meet some primitive data types. Do not try storing phone numbers as actual numbers. StringTokenizer phone number program java-forums.org. I'll post in my code ... Hi. Do you mean checking the format? These are not compatible with other datatypes. As per UniCode, we have ” 65536 (216) “ characters numbered from 0 to 65535. Include the dashes in the output. The char type cannot take negative values. Area code 800 Trunk Code 555 Phone no 1212 Extn 1234 The possible input formats are listed below. Note: Browsers that do not support "tel" fall back to being a standard "text" input. Allow mobile users to send an SMS to this number: This will automatically open the mobile device's default SMS messaging app with the phone number already entered, saving users from having to type the number again. Do not let the first three digits contain an 8 or 9 (but don't be more restrictive than than), and make sure that the second set of three digits is not greater than 742. Even though there are many numeric types in Java, the most used for numbers are int (for whole numbers) and double (for floating point numbers). However, if you were storing how many upvotes a forum post got ahem, it would make sense to store that as a number, so it's easier to increase that number by one, when you upvote my post ahem. Write a class that uses the StringTokenizer class to identify the parts of a phone number. Please sign in or sign up to post. The class should have at least three public ... Hi again guys, I've been working on a personal project again in Unit 3 of my text book and this time they want me to make a random phone number generator. A smaller type value can be given to bigger type variable. Some phone numbers generally use hyphens and possibly parentheses. int 4 bytes -2,147,483,648 to 2,147,483,647, long 8 bytes -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807, long 8 bytes -9,223,372,036,854,775,808 to 9,223,372,036,854,775,80. Definition and Usage. my post C:\JAVA_PROGRAMMING_CODE\code1\RandomPhoneNum>javac RandomPhoneNum.java RandomPhoneNum.java:23: cannot find symbol symbol : ... \\d\\d\\d - 3 digits [,\\s] - a comma or whitespace character (it should be a dash not a comma) () - thse don't buy anything ? Lets say you were building a web app that took subscriptions. Java program to auto dial a calling card phone number, problem with entering card number. One downside I guess would be that you could "accidentaly" perform math on the phone number if you store it as an integer, but I really don't see how you could end up doing that. You can store a number in a variable but there are different formats used to represent a number and each format takes a different amount of storage. What should be Java data type in Bean (POJO) classes for that? You're welcome Morten, and thanks Jennifer Nordell for the upvote...LOL. This can be used instead of int or other integer types to save memory when you are certain that the value will be within -128 and 127: ... A String in Java is actually a non-primitive data type, because it refers to an object. Assume that the format of the phone number is (nnn) nnn-nnnn. So boolean values cannot be assigned to other types and another type of values cannot be assigned to boolean variables. We need to look more closely at data and, to get things moving, numeric data. These data types can be collected with multiple Question Types: The properties for these three data types are as straightforward as the data types themselves. Also, the examples you mention show a further complication: The "+" sign is generally used to mean that a country code follows - but that's only the case with the first number, not the second. and double types to work with a fractional (decimal) type of data, double is preferred over the float. (in C, long is a data modifier but in Java long is a data type). For example in decimal you can say that 1/10 is 0.1, exactly but 1/3 is more troublesome because it is 0.33333... going on repeating forever. © 2020. To declare a byte variable you would use: If you try to store a value bigger than a variable of a given type can store then you will either be warned at compile time or when you run the program. In java a logical expression results in a logical value (true or false). This allows you the ability to store international phone numbers properly, should that need arise. Each memory location has a fixed number of bits and this limits exactly what you can store. So it is preferred to use double variables rather than float.

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